I did one a while ago and you have to make sure that the cakes are perfectly level. I used three dowels one down the middle and one on each side and i made sure they also went a little bit through the cake board to help keep it sitting up. I hope this helps and good luck

No, I don't have a pic, I took mine apart already. There are a few pics in the galleries if you do a search for spongebob. It's a 3-d sponge. I just can't keep him standing. I have a thicker dowel straight down through the middle and one on each side also. I think I'm going to try putting cardboard layers every 2 layers. Hopefully this will help.

Thanks for the quick replies! Any more ideas are still welcomed, I have to bake another cake before I can continue anyway.